Author Topic: Dryer won't quit heating  (Read 202 times)

Online Joey_Bullock

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Dryer won't quit heating
« on: January 14, 2015, 12:00:22 AM »
Kenmore Elite SmartHeat HE4, Model 110.85862400, S/N MS1614

I found dryer running but not heating with 240 VAC at terminal block.  The heating element and high limit had continuity but thermal cutout was open.  I replaced the thermal cutoff and tested the thermistor while convenient and found it measured 14.65 ohms at 65 to 66 F.  According to the tech sheet 13.6 to 13.26 ohms is normal for that temp.  I cleaned the blower wheel and checked the vent for obstructions.  I connected the vent to the dryer, inserted a digital thermometer in the vent line at the dryer outlet and started the dryer.  Airflow is good.  I found that the heating element didn't cycle off.  I stopped the machine at 175 F.  I'm not sure  what to test next.  Is the difference in measured resistance I found at 65 to 66 F enough to create the overheating problem?  Should I be leaning toward machine control electrinics?  Any advice or direction would be appreciated.         


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Offline keithvibe

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Re: Dryer won't quit heating
« Reply #1 on: January 14, 2015, 05:33:36 AM »
disconnect the vent and then take a temp reading.
never take a temp reading with the vent attached it will throw off your reading.
What was the thermostat rating? 150, 160, 170? I wasn't able to read the stamp in anything I could find online.
If you get the right temp reading + or - 5deg the unit is fine and start checking the venting again.

Offline dab147315

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Re: Dryer won't quit heating
« Reply #2 on: January 14, 2015, 08:39:05 AM »
Have you tested the heating element for ground to the canister?May want to install a new thermistor and retest temperature at exhaust.You should  be looking around 155 degrees.Or you have a possible bad board.Tech Sheet in attachment below.
« Last Edit: January 14, 2015, 08:42:28 AM by dab147315 »

Offline niobrara

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Re: Dryer won't quit heating
« Reply #3 on: January 14, 2015, 08:52:58 AM »
Have you tested the heating element for ground to the canister? My thoughts also.

Online Joey_Bullock

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Re: Dryer won't quit heating
« Reply #4 on: January 16, 2015, 09:09:37 PM »
I double checked the temp settings and checked the heating element again for continuity and ground.  I got a better thermometer and rechecked the thermistor resistance.  The readings very close to the spec's and they changed correctly with temperature.  I replaced the machine electronic control board and now the heating element appears to be cycling and on and off at the correct temps.  I appreciate the tech support.  Thanks.

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Offline dab147315

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Re: Dryer won't quit heating
« Reply #5 on: January 17, 2015, 09:48:43 AM »
Thanks Joey for letting us know.

 

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